Intraocular lens

Abstract

An intraocular lens comprises an optic and at least two haptics. Each haptic is offset in an anterior direction from a central optic plane of the optic. The offset allows for predictable posterior vaulting upon implantation.

What is claimed: 
     
       1. An intraocular lens comprising:
 an optic being substantially circular and having an optic anterior surface, an optic posterior surface, and an optic edge surface at a periphery of the optic, the optic edge surface connecting the optic anterior surface and the optic posterior surface; and 
 at least two haptics, each haptic having a shoulder segment coupled to the periphery of the optic, an arm segment extending out from the shoulder segment, a haptic anterior surface, and a haptic posterior surface; 
 wherein a central optic plane divides the optic edge surface in half, wherein a central haptic plane divides the arm segment in half, and the central haptic plane is spaced apart in an anterior direction from the central optic plane, and 
 wherein a thickness of the shoulder segment increases continuously from the periphery of the optic to the arm segment of the haptic, and the thickness is measured in a direction parallel to an optical axis of the optic, 
 wherein the haptic anterior surface of each haptic comprises a taper surface extending across the shoulder segment, the taper surface is simultaneously curved and concave throughout the taper surface, the taper surface intersects an anterior arm surface of the arm segment, the intersection forms a discontinuity between the taper surface and the anterior arm surface, and the anterior arm surface is planar. 
 
     
     
       2. The intraocular lens of  claim 1 , wherein the haptic anterior surface of each haptic comprises the anterior arm surface, the haptic posterior surface of each haptic comprises a posterior arm surface, the anterior arm surface of each haptic is spaced apart from the central optic plane by a first offset distance on a line parallel to an optical axis of the optic, the posterior arm surface of each haptic is spaced apart from the central optic plane by a second offset distance on the line parallel to the optical axis, and the second offset distance is less than the first offset distance. 
     
     
       3. The intraocular lens of  claim 2 , wherein the anterior arm surface of each haptic and the posterior arm surface of each haptic are located anterior to the central optic plane. 
     
     
       4. The intraocular lens of  claim 2 , wherein the anterior arm surface of each haptic is located anterior to the central optic plane, and the posterior arm surface of each haptic is located posterior to the central optic plane. 
     
     
       5. The intraocular lens of  claim 1 , wherein the shoulder segment of each haptic has a through hole from the haptic posterior surface to the taper surface of the haptic anterior surface. 
     
     
       6. The intraocular lens of  claim 1 , wherein the haptic posterior surface of each haptic comprises a step feature at the shoulder segment. 
     
     
       7. The intraocular lens of  claim 6 , wherein the haptic posterior surface of each haptic comprises a posterior arm surface, and the step feature of each haptic protrudes in a posterior direction from the posterior arm surface. 
     
     
       8. The intraocular lens of  claim 7 , wherein the step feature of each haptic comprises a step surface that intersects the posterior arm surface at a barrier angle substantially greater than zero. 
     
     
       9. The intraocular lens of  claim 8 , wherein the haptic anterior surface of each haptic comprises the anterior arm surface, the anterior arm surface is spaced apart from central optic plane by a first offset distance on a line parallel to an optical axis of the optic, the posterior arm surface of each haptic is spaced apart from the central optic plane by a second offset on the line parallel to the optical axis, and the second offset is less than the first offset distance. 
     
     
       10. The intraocular lens of  claim 1 , wherein the arm segment of each haptic is planar on its anterior side. 
     
     
       11. The intraocular lens of  claim 1 , wherein the arm segment of each haptic is planar on its posterior side. 
     
     
       12. The intraocular lens of  claim 1 , wherein the increase in the thickness of the shoulder segment occurs below the taper surface. 
     
     
       13. The intraocular lens of  claim 1 , wherein the taper surface has a concave curvature having a radius centered on a point spaced apart in the anterior direction from the central optic plane. 
     
     
       14. The intraocular lens of  claim 1 , wherein the taper surface is bounded in plan view by diameter D 2  and diameter D 3 , the taper surface intersects the optic at diameter D 2 , the taper surface intersects the anterior arm surface of the haptic at diameter D 3 , and the thickness of the shoulder segment increases continuously from diameter D 2  to diameter D 3 . 
     
     
       15. The intraocular lens of  claim 1 , wherein the haptic anterior surface of each haptic comprises a leading edge and a trailing edge, and the taper surface extends from the leading edge to the trailing edge. 
     
     
       16. The intraocular lens of  claim 15 , wherein trailing edge includes a trailing edge segment at the taper surface, and the trailing edge segment has a concave radius centered on a point spaced radially apart from the periphery of the optic.